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The basepoint derivative $df_p$ is a map from the tangent space at $p$ to the tangent space at $q=f(p)$. It sends a tangent vector $v$ to the pair $(q, Df(p)v)$, packaging the ordinary derivative with the target basepoint.

Conditions: $U$ is an open subset of $\mathbb{R}^n$.; $f : U \to \mathbb{R}^m$ and $f \in C^1$.; $q = f(p)$.

The basepoint derivative $df_p$ is a map from the tangent space at $p$ to the tangent space at $q=f(p)$. It sends a tangent vector $v$ to the pair $(q, Df(p)v)$, packaging the ordinary derivative with the target basepoint.

Conditions: $U$ is an open subset of $\mathbb{R}^n$.; $f : U \to \mathbb{R}^m$ and $f \in C^1$.; $q = f(p)$.

The point $p$ serves as a basepoint. Retaining it motivates a basepoint-compatible notion of derivative, which is discussed next in the video.

Conditions: Applies to the first coordinate $p$ in $(p,v)\in T_p\mathbb{R}^n$

The point $p$ serves as a basepoint. Retaining it motivates a basepoint-compatible notion of derivative, which is discussed next in the video.

Conditions: Applies to the first coordinate $p$ in $(p,v)\in T_p\mathbb{R}^n$